2 Answers
2

Assuming you are using wp_signon, simply check if the returned object is a WP_Error instance, evaluate the WP_Error::get_error_code(), and output appropriate HTML/CSS that your form needs to flag errors.

Could you reduce it a little bit, take the parts out that are not needed to answer the question and add some explanation? Oh, and welcome to WordPress Stack Exchange!
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toscho♦Oct 6 '12 at 12:01

Yep not the first time here but not very comfortable with Stack Exchange. :) Here is the tutorial I followed: wparena.com/how-to/… Although it seems to works fine, I have another problem... so another thread, right?
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AurélienOct 6 '12 at 12:08